linux-kernel - Re: [PATCH v8 14/16] drm/mediatek: Support CRC in display driver

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Date: Wed, 12 Jun 2024 01:22:23 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: Shawn Sung (宋孝謙) <Shawn.Sung@...iatek.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: "linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bibby Hsieh (謝濟遠) <Bibby.Hsieh@...iatek.com>,
	"jason-ch.chen@...iatek.corp-partner.google.com"
	<jason-ch.chen@...iatek.corp-partner.google.com>,
	Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
	"daniel@...ll.ch" <daniel@...ll.ch>, "p.zabel@...gutronix.de"
	<p.zabel@...gutronix.de>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, "airlied@...il.com" <airlied@...il.com>,
	"sean@...rly.run" <sean@...rly.run>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "fshao@...omium.org" <fshao@...omium.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH v8 14/16] drm/mediatek: Support CRC in display driver

Hi, Shawn:

On Thu, 2024-06-06 at 17:26 +0800, Shawn Sung wrote:
> From: Hsiao Chien Sung <shawn.sung@...iatek.com>
> 
> Register CRC related function pointers to support
> CRC retrieval.
> 
> Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> ---

[snip]

> 
> +static void mtk_crtc_crc_work(struct kthread_work *base)
> +{
> +	struct drm_vblank_work *work = to_drm_vblank_work(base);
> +	struct mtk_crtc *mtk_crtc =
> +		container_of(work, typeof(*mtk_crtc), crc_work);
> +	struct mtk_ddp_comp *comp = mtk_crtc->crc_provider;
> +
> +	if (!comp) {
> +		DRM_WARN("%s(crtc-%d): no crc provider\n",
> +			 __func__, drm_crtc_index(&mtk_crtc->base));
> +		return;
> +	}
> +
> +	if (mtk_crtc->base.crc.opened) {
> +		u64 vblank = drm_crtc_vblank_count(&mtk_crtc->base);
> +
> +		comp->funcs->crc_read(comp->dev);
> +
> +		/* could take more than 50ms to finish */
> +		drm_crtc_add_crc_entry(&mtk_crtc->base, true, vblank,
> +				       comp->funcs->crc_entry(comp->dev));

It seems that you could regenerate cmdq packet for crc here. So crtc
atomic flush and crc could use the same mailbox channel.

Regards,
CK

> +
> +		drm_vblank_work_schedule(&mtk_crtc->crc_work, vblank + 1, true);
> +	} else {
> +		comp->funcs->crc_stop(comp->dev);
> +	}
> +}
> +